package com.yunxi.core.base;

import com.google.gson.Gson;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Profile;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import java.lang.reflect.Method;

/**
 * 切面类
 */
@Aspect
@Component
@Profile({"dev"})//定义使用环境,dev.stage,prod
//@Order(1) 多切面定义优先级 before由小到大,after由大到小
public class WebLogAspect {

   private final static Logger logger = LoggerFactory.getLogger(WebLogAspect.class);
   private final String LINE_SEPARATOR = System.lineSeparator();//换行符

   //定义切点
   @Pointcut("@annotation(com.yunxi.core.base.WebLog)")
   public void webLog() {}

   /**
    * 在切点之前织入
    * @param joinPoint
    * @throws Throwable
    */
   @Before("webLog()")
   public void doBefore(JoinPoint joinPoint) throws Throwable {
      // 开始打印请求日志
      ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
      HttpServletRequest request = attributes.getRequest();

      // 获取 @WebLog 注解的描述信息
      String methodDescription = getAspectLogDescription(joinPoint);

      // 打印请求相关参数
      logger.info("========================================== Start ==========================================");
      // 打印请求 url
      logger.info("URL            : {}", request.getRequestURL().toString());
      // 打印描述信息
      logger.info("Description    : {}", methodDescription);
      // 打印 Http method
      logger.info("HTTP Method    : {}", request.getMethod());
      // 打印调用 controller 的全路径以及执行方法
      logger.info("Class Method   : {}.{}", joinPoint.getSignature().getDeclaringTypeName(), joinPoint.getSignature().getName());
      // 打印请求的 IP
      logger.info("IP             : {}", request.getRemoteAddr());
      // 打印请求入参
      logger.info("Request Args   : {}", new Gson().toJson(joinPoint.getArgs()));
   }

   /**
    * 在切点之后织入
    * @throws Throwable
    */
   @After("webLog()")
   public void doAfter() throws Throwable {
      // 接口结束后换行，方便分割查看
      logger.info("=========================================== End ===========================================" + LINE_SEPARATOR);
   }

   /**
    * 环绕,监控切点全流程
    * @param proceedingJoinPoint
    * @return
    * @throws Throwable
    */
   @Around("webLog()")
   public Object doAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
      long startTime = System.currentTimeMillis();
      Object result = proceedingJoinPoint.proceed();
      // 打印出参
      logger.info("Response Args  : {}", new Gson().toJson(result));
      // 执行耗时
      logger.info("Time-Consuming : {} ms", System.currentTimeMillis() - startTime);
      return result;
   }

   /**
    * 获取切面注解的描述
    *
    * @param joinPoint 切点
    * @return 描述信息
    * @throws Exception
    */
   public String getAspectLogDescription(JoinPoint joinPoint)
           throws Exception {
      String targetName = joinPoint.getTarget().getClass().getName();
      String methodName = joinPoint.getSignature().getName();
      Object[] arguments = joinPoint.getArgs();
      Class targetClass = Class.forName(targetName);
      Method[] methods = targetClass.getMethods();
      StringBuilder description = new StringBuilder("");
      for (Method method : methods) {
         if (method.getName().equals(methodName)) {
            Class[] clazzs = method.getParameterTypes();
            if (clazzs.length == arguments.length) {
               description.append(method.getAnnotation(WebLog.class).description());
               break;
            }
         }
      }
      return description.toString();
   }
}
